Depends on whose barn she was in, but she should have basics–she can w/t/c, though she’s more likely to fall into the canter, and she’ll probably have a solid preference for one lead over the other. She may or may not know how to lunge or ground-drive (it may have been done when she was training, but she probably won’t have had it done much or at all since.) She’s not going to have much experience being “on the bit” the way most people are used to. You’ll need to get used to easing up on her mouth rather than pulling back. She SHOULD know that if you sit chilly with long stirrups and aren’t giving her a lot of mouth contact, you want her relaxed.
A lot depends on her temper. I got lucky when I got Lucky ( ) because he’s an old war horse–64 starts up and down the east coast with a solid workman attitude all through his career. It’s not in his nature to put up a fuss or be hyper-spooky about things. Generally, if I remained calm about something when we would try something new, he’d keep calm about it. My old TB, otoh, was the ultra-observant one and you better believe if that spreader is parked six inches over from where it was yesterday, he noticed and was suspicious. He had to be worked consistently and calmly and not given time to consider anything scary too much.